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F. M.- LEGHNER. GOAL AND ROCK DRILLING MACHINE.

No. 250,370. Patented Dec. 6,1881.

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GOAL AND ROCK DRILLING MACHINE. No. 250,370. Patented Dec. 6,1881.

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I. M. LEGHNER. GOAL AND ROGK DRILLING MACHINE.

No. 250.370. Patented Dec. 6,1881.

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' UNrTEo TATES PATENT Darren. I

FRANCIS M. LECHNER, OF COLUMBUS, OHIO, ASSIGNOR TO THE LEGHNER MININGMACHINE OOMPAN Y, OF SAME PLACE.

COAL AND ROCK DRILLING MACHINE.

SPECIFICATION forming part of Letters Patent No. 250,370, dated December6, 1881.

Application filed April 15, 1881. (No model.)

To all whom it may concern:

Be it known that I, FRANCIS M. LECHNER, a citizen of the United States,residing at Golumbus, in the county of Franklin and State of Ohio, haveinvented certain new and useful Improvements in Coal and Rock DrillingMachines; and I do hereby declare the following to be a full, clear, andexact description of the invention, such as will enable others skilledIO in the art to which it appertains to make and use the same,ret"erencebeing had to the accompanying drawings, and to letters or figures ofreference marked thereon, which form a part of this specification.

I5 Figure 1 is a longitudinal vertical section of' my improveddrilling-machine. Fig. 2 is a rear elevation. Fig. 3 is a top-plan viewofthe outer frame detached. Fig. 4 is a top plan of theinner framedetached. Fig. 5 is a side view of the nut and its operating devices,the screwshaft and carrying-frame being shown in crosssection. Fig. 6 isa cross-section of the screw and thimble. Fig. 7 is aview of thelever,detached, used to engage the nut with the screwshaft and to disengage ittherefrom. Fig.8 is a view of the sectional drill. Fig. 9 is a sideelevation, on a reduced scale, of the outer frame and the bracingmechanism. Fig. 10 is a top plan view of the last said parts.

0 The movable parts of the mechanism are suspended or supported in aframe which can be made stationary in the mine, and which, in thedrawings, is shown to be composed of vertical standards A A, bottomcross-piece, A, and an arch, A at the top. These can be, and preferablyare, formed in one piece of metal.

B represents a boss projecting from thearch A and provided with acentral aperture, 12. Through this aperture passes-a bolt, whereby theupper end of the frame can be firmly pressed against the roof of themine. B represents a similar boss, projecting from the bottom piece, A,of the frame, and through it passes a bolt for pressing against thefloor of the mine.

Upon this outer frame the inner frame, which carries the operatingdevices, is suspended.

The inner frame is composed of a vertical portion and ahorizontalport-ion, substantially at right angles to each other. Thevertical 5o portion is composed of the side bars, 0 O, a

top cross piece, 0 an intermediate crosspiece, 0 and the plate 0 U is abottom cross-bar, which, if desired, may be employed, though underordinary circumstances sufficient strength is insured without it. Thehorizontal portion of the inner frame lies substantially in the samehorizontal plane as the upper crossbar, and is composed of the sidebars,D D, and the end bar, D This frame last described is supported onthe sta- 6o tionary frame A, A, and A by means of trunnions E E,projecting from the upper end, preferably, of the inner frame, andmounted in bearings formed in the uprights of the outer frame. When thussupported the inner frame can be vibrated on the trunnions E E, so thatthe drill can be operated at any desired angle,

as will more fully hereinafter appear.

F represents the drill, the construction of which in detail will be morefully set forth, attention at present being directed to the means ofoperating it. It is attached to the end of the screw-shaft G by means ofa squared socket on the latter, or by a set-screw or other suitabledevice. The screw-shaft G rotates the drill 7 5 and at the same timegraduallyfeeds it forward into the coal or other material upon which thedrill is operating. The screw-shaft G is mounted upon the inner frame,above described, in two bearings. One of these bearings is the hub H ofwheel H, mounted upon shaft G in rear of the vertical portion of theinner frame. The shaft is provided with two longitudinal slots, g g, andthe wheelHand its hub H en'- gage with the shaft by means of two keys orfeathers, whereby the shaft is permitted to move longitudinally throughthe wheel and hub, and at the same time be rotated thereby. At the rearend of the shaft G a nut is placed for limiting the movement of theshaft, there being preferably a collar, 9 between the nut and the wheelH; or,instead of a nut, a square collar and set-screw may be used, asshown at 9 The hub H of the wheel H is mounted in aboxing at I on thecross-bar G a cap of sub- 5 stant-ially the ordinary character beingplaced above the same. The other bearing of the screw-shaft G isprovided by a thimble, K, mounted in a boxing at L on the outer or endbar, D of the horizontal part of the inner IOG frame. The thimblerotates with the screw, but does not interfere with its longitudinalmovements, and thus the threads of the screw are guarded from the wearwhich they would experience if they should rotate in direct contact withthe boxing. It will be seen that when the screw-shaft is thus mounted ina swinging frame it can be readily turned to any desired angle. Thewheel H, which rotates the screwshaft, receives motion from a pinion, M,beneath it. This pinion is carried by the crank-shaft N, which latter ismounted on the cross-bar G in a suitable boxing at N. At one end thecrank-shaft carries a crank-wheel, 0, and at the other a fly-wheel, 0.Power is imparted to the shaft by means of an engine supported on thevibrating frame. It is preferably attached thereto by means of theabove-described plate 0 which carries a yoke, P, lying in horizontalplanes.

The engine consists of an oscillating cylinder, Q, mounted upontrunnions q q. The spindles or shafts of the trunnions are mounted,

one in the yoke P and the other in the plate 0 as shown at R R. Thepiston S is connected to the crank-wheel in the ordinary manner. Thecylinder is preferably operated by air, which is admitted to andexhausted from it through plate 0 T represents a handle attached to theflywheel O, which may be used to assist the engine in starting themachine.

It will now be seen that if the frame A A A be braced against the roofand the floor of the mine, and if the engine at Q R S 0 be started, thescrew-shaft G will be rotated through the parts N, M, and H, and thatthe drill F will be rotated therewith; but there is required not only arotary motion of the drill and its shaft, but also a longitudinal motionthereof, in order to feed the drill forward.

This longitudinal motion is caused by a nut, U U, carried by the upperpart of the inner frame, and arranged to be engaged with and disengagedfrom the screw shaft G. It is formed in two parts, U U, respectively,carried by arms V V. These arms are pivoted between twoupwardly-extending lugs, v o, as shown in Figs. 4 and 5.

W represents the lever whereby the sections of the nut can be engagedwith the shaft or separated therefrom. It is pivoted to a lug,m,projecting inwardly from the side bar, D, as shown at :20, Fig. 5.

W is a plate attached to or formed with the lever W. It has twocurvilinear slots, as shown in Fig. 7, by which it engages with twostuds, 20 20, carried respectively by the nut-sections UU. If theleverWVbe thrust in the direction of the arrow Y, the nut-sections will beseparated from the screw-shaft, and the latter will revolve withoutengagement therewith, or it can be drawn longitudinally backward withoutrotating.

The drill F is made in sections, each section being preferably aboutthirty inches in length. The sections are successively joined together,as they are, one after another, driven into the coal or rock. By makingthe drill thus in sections I am enabled to use a much shorter screwshaftthan would be necessary if the drill were all in one continuous piece.

Z ZZ represent a brace for avoiding the disadvantages that result fromcross-strains upon the vertical stays, said strains being caused by thereaction of the drill. brace is pivoted to the outer frame on line ofthetrunnions E E, and is constructed of metal pipes arranged to form ayoke, the legs of which are pivoted, as described, and to which an arm,Z, is secured.

Z is a rod adjnstably connected to the pipe Z, and provided with a dog,2, at the lower end, by which it engages with thefloor of the mine.

z is a set-screw passing through the pipe Z and engaging with the rodZ'and by this setscrew the length of the brace can be adjusted at will.

These last-described parts are shown, on a reduced scale, in Figs. 9 and'10.

What I claim is- 1. In combination with the outer frame, A A A and therotating and longitudinally-reciprocating drill-shaft, the inner framehaving the vertical part for the sup-port of the engine and thehorizontal part for the support of the drill-shaft, substantially as andfor the purposes set forth.

2. The combination, with the screw-threaded shaft arranged to rotate andalso to be moved longitudinally in its bearings, and the hinged frame DD D of the thimble K, surrounding the thread of the shaft, and providedwith tongues for engaging therewith, as set forth.

3. The combination, with the stationary frame, and the inner framehinged thereto and formed with avertical part and a horizon tal partfofthe engine mounted on the vertical part of said frame, and thescrew-shaft mounted on the horizontal part thereof, andpower-transmitting devices between said engine and said shaft,substantially as set forth.

4. The combination, with the rotating and longitudinally reciprocatingdrill shaft and the swinging frame which supports said shaft, of thelever W, the plate W, the nut-sections U U, and the arms V V, pivoted tothe swinging frame, substantially as and for the purposes set forth.

In testimony whereof I affix my signature in presence of two witnesses.

FRANCIS M. LEOHNER.

Witnesses WILLIAM H. ALBERY, THOMAS C. ORNDORFF.

Preferably this

